Plying device



Sept. 8, 1959 sc ETAL 2,902,817

FLYING DEVICE Filed Sept. 25. 1958 m m 9 w w.

JAMES WATT IJSBRAND HEIJNIS HANS ALWIN SCHRENK Y M/ lib ATTGRNEY United States Patent 2,902,817 PLYING DEVICE Hans Alwin Schrenk and James Watt Ijsbrand Heijnis, Arnhem, Netherlands, assignors to American Enka Corporation, Enka, N.C., a corporation of Delaware Application September 25, 1958, Serial No. 763,324

Claims priority, application Netherlands October 9, 1957 3 Claims. (Cl. 57-5836) This invention relates to a mechanism for twisting to gether a plurality of yarns or threads to form a plied structure. More particularly, the invention relates to an improved element for guiding the singles to the point of plying in a cord forming operation.

A device for twisting together two threads by means of a rotatably mounted hollow spindle provided with a lateral thread discharge opening and having a stationary holder for a yarn package mounted on the spindle is well known. *It has been proposed to use with such a device a freely rotatable thread guiding system with a thread guide fitted to a cross-arm, mounted coaxially with the hollow spindle, the thread guiding system being equipped with a freely rotatable roller containing two peripheral grooves, with thread guides for supplying the two threads to separate grooves being present in the roller.

On using the above-referred to device for twisting together two threads, one yarn package-the so-called inner yarn package-is present on the holder mentioned. The yarn from this package is guided to one of the grooves of the roller mounted in the freely rotatable thread guiding system, from where it passes on to the so-called cabling point, where the thread is twisted together with a second thread. This second thread originates from a second yarn package-the outer yarn packagepresent at that end of the rotatably mounted hollow spindle which is opposite to the yarn package holder. After the second thread has been pulled from its package, it is guided through the rotating hollow spindle, and leaves this spindle through the lateral opening therein. It then passes successively through the thread guide on the cross-arm of the rotatable thread guiding system, the thread guide mounted opposite to the second groove in the roller, and through the groove, after which it goes to the point of assembling, or the cabling point.

, Due to the rotation of the hollow spindle, the outer am balloons around the inner yarn package and by its" contact with the cross-arm rotates the yarn guiding system including the grooved roller. The two threads moving towards the cabling point run almost slip-free around the grooved roller. This slip-free running insures that equal lengths of the two threads are supplied to the cabling point. Thus, when a cord formed in this cabling point is tensioned or loaded, each of the two threads constituting the cord will take one-half of the load. It follows that in the case of breakage of the cord, both threads will have been subjected to a maximum load.

In the described device, the grooved roller rotates around an axle disposed perpendicular to the axis of rotation of the thread guiding system. It has been found, however, that this arrangement does not always insure a quiet, smooth rotation of the thread guiding system. It is an object of the present invention to provide an improved thread guiding element for use in a appear hereinafter.

The present invention is characterized in that in a thread guiding system of the above-mentioned type the grooved roller has been mounted in the rotatable thread guiding system so that its axis of rotation coincides with that of the rotatable thread guiding system and that guides are present for guiding the two threads from the guiding grooves in the roller to the cabling point.

This arrangement insures a quiet, smooth rotation of the rotatable thread guiding system, while the guiding of the threads via the grooves of the roller to the cabling point causes no diificulties. I

The thread guiding system with the grooved roller of the present invention can be mounted in various ways. It may, for example, be mounted on the holder for the inner yarn package or on the jacket placed around this package during the twisting process. In the preferred embodiment, however, the roller of the present thread guiding system is rotatable around an axle which is fitted to the bottom of a cage. This cage on the underside is provided with a laterally projecting arm having a guiding eyelet on the free end. The upper side of the cage is connected to a rotatably mounted hollow shaft which serves as an axial discharge for the twisted cord. The side walls of the cage have two thread guiding openings for supplying two threads to the separate grooves on the thread guiding roller. Two additional thread guides are present for guiding the threads from the grooves of the roller to the cabling point.

In this preferred embodiment a new inner yarn packa single, helical screw, to which thetwo threadsare supplied from the hollow spindle with the aid of a guttershaped guide. After leaving this groove, the threads are guided back to the hollow spindle with the aid of a gutter-shaped guide. With this device the .twistingfto gether of two threads is possible onlywhen the yarn speeds and the number of revolutions ofthe: hollow spindle are accurately adjusted to one another. In the device of the present invention, this is unnecessary.

The invention will be further described by reference to the attached drawing which, by'way of example, repre sents an embodiment of the invention.

Figure 1 is an elevational view partly in section, showing a thread guiding system constructed in accordance with the invention in use with a direct cord forming machine;

Figure 2 is an enlarged view in partial section of the thread guiding system shown in Figure l; and

Figure 3 is a sectional view taken along the line II'IIII of Figure 2.

In Figure 1, numerals 1 and 2 indicate two yarn packages from which the threads 3 and 4, respectively, are withdrawn and twisted together at a point 5 to form a cord 6. Cord 6 is carried off, via a thread guiding system 7, to be described in more detail below, by a yarn collection device, preferably a winding device.

The thread 4, or so-called inner yarn, is guided from the inner yarn package 2 via a thread guide 8, an inner yarn tension device or inner yarn tensioner 9 and a thread guide 10 to the cabling point 5.

The outer. yarn 3, unwinding from the outer yarn package 1, is guided via an eyelet 11, an outer yarn tension device or outer yarn tensioner 12 to the supply opening:13=ofza hollow spindle: 143rotating with the'aid of a pulley 15 driven by a driving belt (not shown). Yarn storage disc 16 is connected to the hollow spindle 14in theiknown'manner; The outer yarn 3 passes through the hollow spindle 14, through an opening 17 in the storage; disk 16 and, after leaving-the member 18 connected with the storage disk, balloons freely to the thread guiding system 7, in which the cord 6 is formed.

Th'e'inner yarn package 2 is disposed on a stator 19, which in the known way has been so constructed that it remains stationary during the rotation of the false twist device formed by the-hollow spindle 14 and the storage disk 16. On the stator 19 a transparent protecting cover 20 is present, on the top edge, of which a bridge 21 is provided, .supporting the thread guide 8, the inner yarn tensioner 9 and the thread guide 10. Since these details form no part of the present invention, they are not shown in detail in the drawing.

The inner and outer yarn tensioners 9 and 12, respectively, which are only indicated schematically, may each consist oftwo gear wheels meshing with some clearance, one of which is braked, for example, magnetically.

However, yarn tensioners of a different construction may also be applied. The yarn tensioners serve to insure that the inner and outer yarns are supplied to the yarn guiding system 7 with tensions as nearly equal as possible, so that both threads are extended elastically to practically the same degree.

Referring now to Figure 2, the thread guiding system 7 consists of two spaced coaxial disks 22 and 23, interconnected by the rods 24 and 25. In the lower disk 22, a pin 26 has been fitted. Pin 26 serves as an axle for a roller 27, which is provided with two spaced peripheral grooves of equal depth. Cross-arm 28 is connected to disk 22 and carries on its free end a guiding eyelet 29. Hooks 30 and 31, which serve to guide the inner and the outer yarn from the grooves in the roller 27 to the cabling point 5, are also attached to disk 22.

In the rod 24 two yarn guiding openings 32 and 33 are present for guiding the inner yarn 4 to the upper groove in the roller 27. A similar guiding opening 34 is present in rod 25 for guiding the outer yarn 3 to the lower groove in the roller 27. The guiding openings 32, 33 and 34 may, if desired, be arranged in such a way that the.

outer yarn 3 passes to the upper groove and the inner yarnto the lower groove. In that event, the dimensions of hooks 30 and 31 would need to be altered.

Upper disk 23 of the thread guiding system 7 is fixedly connected to the lower end of a hollow shaft 35 which is rotatably mounted in a set of bearings 36, connected to the frame 37 of the machine.

In twisting together two threads with the aid of the present invention, the ballooning outer yarn 3, on passing through the guiding eyelet 29 carried by arm 28 rotates the thread guiding system 7 including hollow shaft 35. As a result of the rotationv of the system 7, the threads 3 and 4, after passing the h00ks30 and 31, are twisted together at the cabling-point 5. I Since-threads 3 and 4 run slip-free aroundthe roller 27 and the grooves in this.

roller are'of equal depth,"these threads are supplied to the. cabling point 5 with equal speed. This contributes towards the formation of a cord in which the component threads have the same length and are therefore equally loaded when the cord is-under tension.

What is claimed is:

1. A thread guiding-assembly comprising a rotatable cage, a thread guiding roller mounted for rotation around a shaft disposed on the axis of said cage, a laterally projecting arm. attached to said cage, a thread guiding member attached to the free end'of said arm, a rotatably mountedhollow shaft attached to the upper end of said. cage and adapted to serve for the axial discharge of a twisted cord, a pair 'of thread guiding openings in the side of said cage adapted to supply two threads to separate grooves of the thread guiding roller, and means for guiding the threads from. the. grooves of theroller to a cabling .point.

2. A thread guiding assembly comprising a rotatable cage, a grooved thread guiding roller mounted for rotation around the axis of said cage and within said cage, a

laterally projecting arm attached to the lower end of said. cage and having thread guiding means attached to the free end thereof, a hollow axial member disposed adjacent the upper end of said cage adapted to serve for the axial discharge of a twisted cord, a pair of thread guides on the sides of said cage adapted to supply two threads to separate grooves of said roller, and means for guiding the threads from the grooves of the roller to a cabling point.

3. In a cord forming apparatus having a rotatably mounted hollow spindle provided with a lateral thread discharge opening, a thread package holder mounted on said spindle, and a freely rotatable thread. guiding system equipped with'a freely rotatable roller containing two References Cited in the file of this patent UNITED STATES PATENTS 2,752,749 De Halleux July 3, 1956 2,811,012 Klein Oct. 29, 1957 2,847,817 Gonsalves Aug. 19, 1,958 

